.demo_box{width:160px;height:160px;float: left;background-color: #fff;}
.orange{background-color: #ff6860}
.lightGreen{background-color: #ccdfcc}
.darkBlue{background-color: #0c555d}
.white{background-color: #fff}
.black{background-color: #262626}

.demo{ clear: left;margin: 10px; float: left;padding: 30px}
.demo .btn{ margin-right: 20px}